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gdns
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send query to all upstream server

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nghttp2
fangdingjun 9 years ago
parent 5cae50d369
commit 783790557e
8 changed files with 4934 additions and 49 deletions
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10
arguments.go
Unescape Escape View File

@ -21,6 +21,10 @@ var DefaultServer []*UpstreamServer
var blacklist_file string var blacklist_file string
var enable_cache = false
var region_file = ""
func (s *ArgSrvs) String() string { func (s *ArgSrvs) String() string {
//Sprintf("%s", s) //Sprintf("%s", s)
return "filter1.txt,udp:8.8.8.8:53" return "filter1.txt,udp:8.8.8.8:53"
@ -86,6 +90,10 @@ func parse_flags() {
log.Fatal(err) log.Fatal(err)
} }
} }
if region_file != "" {
ip_region = parse_net(region_file)
}
} }
func init() { func init() {
@ -105,4 +113,6 @@ func init() {
flag.StringVar(&blacklist_file, "blacklist", "", "the blacklist file") flag.StringVar(&blacklist_file, "blacklist", "", "the blacklist file")
flag.BoolVar(&debug, "debug", false, "output debug log, default false") flag.BoolVar(&debug, "debug", false, "output debug log, default false")
flag.StringVar(&hostfile, "hosts", "", "load special ip from hosts or /etc/hosts") flag.StringVar(&hostfile, "hosts", "", "load special ip from hosts or /etc/hosts")
flag.BoolVar(&enable_cache, "enable_cache", false, "enable cache or not")
flag.StringVar(&region_file, "region_file", "", "local country region ip range file")
} }

527
blacklist.txt
Unescape Escape View File

@ -0,0 +1,527 @@
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}

80
cocurrent.go
Unescape Escape View File

@ -0,0 +1,80 @@
package main
import (
//"fmt"
"github.com/miekg/dns"
"net"
"time"
)
var ip_region []*net.IPNet
type res struct {
m *dns.Msg
err error
}
func query(m *dns.Msg) *dns.Msg {
resch := make(chan *res, len(DefaultServer))
for _, s := range DefaultServer {
go query_one(s, m, resch)
}
delayed := []*dns.Msg{}
slen := len(DefaultServer)
got := 0
loop:
for {
select {
case r := <-resch:
r1 := *r
if r1.err != nil {
logger.Error("error %s\n", r1.err.Error())
continue
}
if in_blacklist(r1.m) {
continue
}
if answer_in_region(r1.m, ip_region) {
return r1.m
} else {
delayed = append(delayed, r1.m)
}
got += 1
if got >= slen {
break loop
}
case <-time.After(900 * time.Millisecond):
break loop
}
}
if len(delayed) == 0 {
logger.Error("empty delayed list")
return nil
}
// return first ok result
for _, m1 := range delayed {
if m1.Rcode == dns.RcodeSuccess {
return m1
}
}
// return NXDOMAIN result
for _, m1 := range delayed {
if m1.Rcode == dns.RcodeNameError {
return m1
}
}
// errror
return nil
}
func query_one(srv *UpstreamServer, m *dns.Msg, ch chan *res) {
m1, err := srv.query(m)
select {
case ch <- &res{m1, err}:
}
}

36
gen_region_cn.py
Unescape Escape View File

@ -0,0 +1,36 @@
#!/usr/bin/env python
import math
import netaddr
import urllib2
url = "http://ftp.apnic.net/apnic/stats/apnic/delegated-apnic-latest"
data = urllib2.urlopen(url).read()
with open("delegated-apnic-lastest", "w") as fp:
fp.write(data)
results = []
with open("delegated-apnic-latest") as fp:
for line in fp:
# format
# apnic|CN|ipv4|1.0.0.0|256|2012232|allocated
l = line.strip()
if not l:
continue
if l[0] == '#':
continue
lns = l.split("|")
if len(lns) != 7:
continue
if lns[2] != 'ipv4':
continue
if lns[1] != 'CN':
continue
ip = lns[3]
mask = 32-int(math.log(int(lns[4]), 2))
cidr = "%s/%d" % (ip, mask)
results.append(cidr)
r = netaddr.cidr_merge(results)
with open("region_cn.txt", "w") as fp:
for a in r:
fp.write("%s,%s,%d\n" % (a.ip,a.netmask, a.prefixlen))

84
ipnet.go
Unescape Escape View File

@ -0,0 +1,84 @@
package main
import (
"bufio"
"fmt"
"github.com/miekg/dns"
"log"
"net"
"os"
"strings"
"unicode"
)
// parse ip range region file
// format
// ip, netmask, prefixlen
func parse_net(fn string) []*net.IPNet {
fp, err := os.Open(fn)
if err != nil {
log.Fatal(err)
return []*net.IPNet{}
}
defer fp.Close()
nets := []*net.IPNet{}
reader := bufio.NewReader(fp)
for {
line, err := reader.ReadString('\n')
if err != nil {
break
}
line = strings.Trim(line, "\r\n")
fnds := strings.FieldsFunc(line, func(c rune) bool {
if unicode.IsSpace(c) {
return true
}
if c == ',' {
return true
}
return false
})
if len(fnds) != 3 {
continue
}
if _, net1, err := net.ParseCIDR(
fmt.Sprintf("%s/%s", fnds[0], fnds[2])); err == nil {
nets = append(nets, net1)
} else {
log.Fatal(err)
}
}
return nets
}
// test ip in ip range region
func in_region(ip net.IP, nets []*net.IPNet) bool {
for _, n := range nets {
if n.Contains(ip) {
return true
}
}
return false
}
// test dns reply A or AAAA in special ip range region
func answer_in_region(m *dns.Msg, nets []*net.IPNet) bool {
for _, rr := range m.Answer {
if a, ok := rr.(*dns.A); ok {
if in_region(a.A, nets) {
return true
}
}
if aaaa, ok := rr.(*dns.AAAA); ok {
if in_region(aaaa.AAAA, nets) {
return true
}
}
}
return false
}

74
ipnet_test.go
Unescape Escape View File

@ -0,0 +1,74 @@
package main
import (
"fmt"
"github.com/miekg/dns"
"testing"
//"os"
)
func TestParseNet(t *testing.T) {
nets := parse_net("net_china.txt")
fmt.Printf("get %d networks\n", len(nets))
fmt.Printf("1st %s\n", nets[0].String())
}
func TestQuery(t *testing.T) {
ip_region = parse_net("net_china.txt")
var c *dns.Client
for _, srv := range []string{
"tcp:114.114.114.114:53",
"udp:8.8.8.8:53",
"udp:192.168.41.1:53",
"udp:4.2.2.2:53",
} {
proto, addr, err := parse_addr(srv)
if err != nil {
t.Error(err)
}
if proto == "tcp" {
c = client_tcp
} else {
c = client_udp
}
upsrv := &UpstreamServer{
Addr: addr,
Proto: proto,
client: c,
}
DefaultServer = append(DefaultServer, upsrv)
}
blacklist_file = "blacklist.txt"
a, err := load_domain(blacklist_file)
if err != nil {
fmt.Println(err)
} else {
Blacklist_ips = a
}
logger = NewLogger("", true)
for _, dn := range []string{
"www.google.com",
"www.sina.com.cn",
"www.taobao.com",
"www.ifeng.com",
"twitter.com",
"www.facebook.com",
"plus.google.com",
"drive.google.com",
"dongtaiwang.com",
"www.ratafee.nl",
"cc.ratafee.nl",
"noddcade.xx.ffs.aafde",
"ndfddcade.xx.ffs.aafde",
"sddf32dsf.comd.ffdasdf.fdsd3eaaaaa",
"www.google.com.hk",
} {
m := new(dns.Msg)
m.SetQuestion(dns.Fqdn(dn), dns.TypeA)
m1 := query(m)
if m1 == nil {
t.Error("query failed")
}
fmt.Printf("%s\n", m1)
}
}

4076
region_cn.txt
View File

File diff suppressed because it is too large Load Diff

26
server.go
Unescape Escape View File

@ -108,6 +108,7 @@ func handleRoot(w dns.ResponseWriter, r *dns.Msg) {
key := fmt.Sprintf("%s_%s", domain, dns.TypeToString[r.Question[0].Qtype]) key := fmt.Sprintf("%s_%s", domain, dns.TypeToString[r.Question[0].Qtype])
if enable_cache {
// reply from cache // reply from cache
if a, ok := dns_cache.Get(key); ok { if a, ok := dns_cache.Get(key); ok {
msg := new(dns.Msg) msg := new(dns.Msg)
@ -130,6 +131,7 @@ func handleRoot(w dns.ResponseWriter, r *dns.Msg) {
) )
return return
} }
}
// forward to upstream server // forward to upstream server
for i := 0; i < 2; i++ { for i := 0; i < 2; i++ {
@ -153,12 +155,14 @@ func handleRoot(w dns.ResponseWriter, r *dns.Msg) {
) )
if res.Rcode != dns.RcodeServerFailure && !in_blacklist(res) { if res.Rcode != dns.RcodeServerFailure && !in_blacklist(res) {
if enable_cache {
// add to cache // add to cache
v := []string{} v := []string{}
for _, as := range res.Answer { for _, as := range res.Answer {
v = append(v, as.String()) v = append(v, as.String())
} }
dns_cache.Add(key, strings.Join(v, "|")) dns_cache.Add(key, strings.Join(v, "|"))
}
w.WriteMsg(res) w.WriteMsg(res)
done = 1 done = 1
break break
@ -168,34 +172,27 @@ func handleRoot(w dns.ResponseWriter, r *dns.Msg) {
// fallback to default upstream server // fallback to default upstream server
if done != 1 { if done != 1 {
for _, dfsrv := range DefaultServer { logger.Debug("%s query %s %s %s, use default server\n",
res, err = dfsrv.query(r)
if err != nil {
logger.Error("%s", err)
continue
}
logger.Debug("%s query %s %s %s, use default server %s:%s, %s\n",
w.RemoteAddr(), w.RemoteAddr(),
domain, domain,
dns.ClassToString[r.Question[0].Qclass], dns.ClassToString[r.Question[0].Qclass],
dns.TypeToString[r.Question[0].Qtype], dns.TypeToString[r.Question[0].Qtype],
dfsrv.Proto, dfsrv.Addr,
dns.RcodeToString[res.Rcode],
) )
res := query(r)
if res.Rcode != dns.RcodeServerFailure && !in_blacklist(res) { if res != nil {
if enable_cache {
// add to cache // add to cache
v := []string{} v := []string{}
for _, as := range res.Answer { for _, as := range res.Answer {
v = append(v, as.String()) v = append(v, as.String())
} }
dns_cache.Add(key, strings.Join(v, "|")) dns_cache.Add(key, strings.Join(v, "|"))
}
w.WriteMsg(res) w.WriteMsg(res)
done = 1 done = 1
break break
} }
}
} }
if done == 1 { if done == 1 {
@ -212,12 +209,13 @@ func main() {
parse_flags() parse_flags()
var err error var err error
if enable_cache {
// create cache // create cache
dns_cache, err = lru.New(1000) dns_cache, err = lru.New(1000)
if err != nil { if err != nil {
log.Fatal(err) log.Fatal(err)
} }
}
dns.HandleFunc(".", handleRoot) dns.HandleFunc(".", handleRoot)

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